idle: fix spelling mistake "iterrupts" -> "interrupts"

There is a spelling misake in comments of cpuidle_idle_call. Fix it.
Signed-off-by: Hewenliang <hewenliang4@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lkml.kernel.org/r/20200110025604.34373-1-hewenliang4@huawei.com

kernel/sched/idle.c

@@ -158,7 +158,7 @@ static void cpuidle_idle_call(void)
 	/*
 	 * Suspend-to-idle ("s2idle") is a system state in which all user space
 	 * has been frozen, all I/O devices have been suspended and the only
-	 * activity happens here and in iterrupts (if any).  In that case bypass
+	 * activity happens here and in interrupts (if any). In that case bypass
 	 * the cpuidle governor and go stratight for the deepest idle state
 	 * available.  Possibly also suspend the local tick and the entire
 	 * timekeeping to prevent timer interrupts from kicking us out of idle